GAZA: At Shifa Hospital on Monday, armed Hamas militants in civilian clothes roved the halls. Asked their function, they said they were providing security. But there was internal bloodletting under way.

In the fourth floor orthopedic section, a woman in her late twenties asked a militant to let her see Saleh Hajoj, her 32-year-old husband. She was turned away and left the hospital. Fifteen minutes later, Hajoj was carried out of his room by young men pretending to transfer him to another hospital section. As he lay on the stretcher, he was shot in the left side of the head. A bit of brain emerged on the other side of his skull.

Hajoj, like five others who were killed at the hospital in this way in the previous 24 hours, was accused of collaboration with Israel. He had been in the central prison awaiting trial by Hamas judges, and when Israel destroyed the prison on Sunday he and the others were transferred to the hospital. But their trials were short-circuited.

A crowd at the hospital showed no pity after the shooting, which was widely observed. A man in his thirties mocked a woman who expressed horror at the scene.

"This horrified you?" he shouted. "A collaborator that caused the death of many innocent and resistance fighters?"

Another man told her, "It was his brother who killed him to wipe away the shame from his family."

Sobhia Jomaa, a lawyer with the Palestinian Independent Commission for Human Rights, said 115 collaborators were in the central prison. None had been executed by Hamas since it took office and their cases were monitored closely, she said.

"The prison provided the sole protection to all of them," she said. "But once it was bombed, many wanted to take revenge."